Make sure your lashes are clean and dry before using the lash serum. Thoroughly remove makeup, oil, and dirt.
Then, using the fine brush, apply a thin line of serum along your lash line, just as you would apply eyeliner. One dip in the bottle is enough for both eyes.
Avoid direct contact with the eyes and allow the serum to absorb for a few minutes before applying other care products or make-up.